Automatic injector-burner



(No Model.) K 3 Sheets-Sheetl 1;

s. o. NOME,A `.4.U'JOIMLIHIG INJBGTR BURNER.

' 190.494,59. t Patented Apr. 4, 1893.

| HHH 3 'SheetsQ-Sl'leet 2.

(No Model.)

S. C. NORTH.

AUTOMATIC INJEGTOR BURNER.

Paten-ted Apr. 4

(No Model.)

s. o. NORTH. AUTOMATIC INJEGTUR' BURNER.

Patent-ed Apr. Ll, 1893.

:as co, Fumo-L TATES ATENT AUTOlVlATlC INJECTOR-BURNER.

SPECIFICATION forming part of Letters Patent No'. 494,591, dated April4, 1893.

Application filed February 11, 1892. Serial No. 421,149- (N0 10d-91|) Toa/ZZ whom, it' may concern:

Be it known that I, STANLEY C. NORTH, a citizen of the United States,residing at Tarrytown, in the county of Westchester and State of NewYork, have invented certain new and useful Improvements in AutomaticInjector- Burners; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The object of myinvention is to provide an injector burner wherein thesupply of oil through the flame outlet is automatically varied inverselyto the pressure of the steam injecting it; so that should said pressureeither fall below or exceed the normal limit at which the apparatus isset, the amount of oil injected will be correspondingly increased ordiminished. A steam boiler furnace supplied with a burner or burners ofthis character will therefore automatically vary their calorific effectto maintain constantly a predetermined pressure of steam within thesteam generator; thereby avoiding waste of fuel, while, at the sametime, causing the burners to respond automatically, without manualintervention, to the varying demands put upon them.

In the accompanying drawings, Figure 1 represents a longitudinal centralsection of one form or modification of my invention. Fig. 2 represents alike view of a second form or modification thereof. Fig. 3 represents across section and elevation on the line 3-3 of Fig. 1. Fig. 4represents, in perspective, a detail of construction. Fig. 5 representsa side elevation of a steam boiler furnace fitted with my improvedburner, a portion of the furnace wall being shown as broken away.

Similar numerals of reference indicate similar parts throughout theseveral views.

Referring to the drawings it will be noted that the apparatus isprovided with a steam supply pipe 5 communicating with a jet nozzle 6,whose discharge orifice is in close proximity to an oil supply pipe 7.In front of the jet nozzle 6 is located a pipe 8, said pipe beingpreferably provided with a flaring delivery end whose inner wallscorrespond in outline to a conical plug 9, fixed upon the end of aspindle 10. The spindle 10 is supported near its outer end, forinstance, by the spider 11, held in place by set screws 12 so that theplug may be accurately centered Within the Haring end of the pipe 8; atits inner end the spindle is extern allyscrew-th readed, as shown, whereit passes through the bushing 13 and is provided with an operatinghand-wheel 14, whereby the plug 9 may be set so as to establish anannular space of the dimensions appropriate to the particularrequirements of the case in hand.

Surrounding the pipe y8 and extending beyond it is an outer pipe 15, forthe supply vof air tothe issuing oil and steam. In the form of myinvention shown in Figs. 1 and 3, this pipe forms the continuation of achamber 16 having openings 17 adapted to be regulated in area by meansof the rotatory register slide 18 having similar openings 19 andprovided with an operating handle 20.

vIn the form of my invention shown in Fig. 2, I have adopted a form ofchamber 21,hav ing an air supply pipe 22, whereby, if desired,pre-heated air instead of cold air may be supplied to the burner.

The operation of the invention is as follows: By means of the hand-wheel14 and its spindle 10, the plug 9 is set at such an adjustment withinthe flaring end of the pipe 8 as has been found to be appropriate forthe generation of steam at the pressure desired. Steam is then admittedthrough the pipe 5 and in passing the oil pipe 7 it draws oil up throughsaid pipe and together with the oil enters the mixing and regulatingpipe 8, and thence passes through the annular space between the plug 9and the end of the pipe 8. The current of oil and steam is ignited as itissues into the pipe 15, where it meets a current of air aidingcombustion. It will be noted that the pipe 15 is extended beyond thepipe S and plug 9 to such a distance that the combined jet of steam andoil is directed upon the inner walls of the pipe 15. It results that thecurrent of air drawn in bythe steam and oil jet is consequently broughtinto the most intimate contact with the particles of said jet, therebyinsuring an efficient combustion. The admission of air may be regulatedby adjusting the register slide 18, or by means of a cock in the pipe22, as the case may be. If

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now, the steam supplied through the pipe 5 increases in pressure beyondthe normal degree to which the burner is set, the back pressure from theplug 9 will be correspondingly increased, and will cause a diminution inthe oil-supply, by reason of the fact that suoli back pressureinterferes with the effective lifting action of the steam jet above theoil supply pipe. Consequently, the supply of oil to the burner is cutdown, the heating eifect of the burner will be correspondinglydiminished and this will continue until the pressure in the boilersupplying the steam is brought back to the normal degree. In likemanner, a decrease in the pressure of the steam, causing a diminishedback pressure Within the pipe 8 will permit the jet pipe 6 to draw upand inject an increased supply of oil, thereby 4raising the heatingeiect of the burner until the steam resumes its normal pressure. It willthus be seen that where the burner is employed to generate steam, aportion of the steam being used to supply the pipe 5, the burneroperates automatically to maintain the boiler pressure to which theapparatus is set. It is evident that by operating the hand wheel lll soas to adjust the plug to a different position with respect to the end ofthe pipe 8, the burner may be set to correspond with and automaticallymaintain, a different steam pressure Within the boiler. In practice, Ihave found that the burner is extremely sensitive in operation,responding at once to accidental variations of steam pressure andrestoring the normal pressure with facilityv and celerity.

It will, of course, be understood thatin starting the burner, steam maybe admitted into the supply pipe 5 from any suitable source; but aftersteam of the desired pressure has been raised in the boilerheated by theburner, then the pipe 5 is to receive its supply from said boiler.

In Fig. 5, I have shown a boiler furnace provided with one of myimproved burners, entering the combustion chamber 23, the steam supplybeing derived from the dome of the boiler 24, and the oil supply fromthe reservoir 25.

Having thus described my invention, what I claim is- 1. An automaticinjector burner, comprising a steam inlet pipe having a j et dischargeopening; an oil supply pipe Whose inlet is in close proximity to thesteam jet; a mixing and regulating pipe into which the steam and oilpipes enter, said mixing and regulating pipe having a contractibleoutlet; and an air inlet pipe surrounding the mixing and regulatingpipe; substantially as described.

2. An automatic injector burner, comprising a steam inlet pipe having ajet discharge opening; an oil supply pipe Whose inlet is in closeproximity to the steam jet; a mixing and regulating pipe into which thesteam and oil pipes enter, said mixing and regulating pipe having acontractible outlet; substantially as described.

3. In an automatic injector burner comprising a steam inlet pipe havinga jet discharge opening; an oil supply pipe whose inlet is in closeproximity to the steam jet; a mixing and regulating pipe into which thesteam and oil pipes enter; a plug located Within the discharge openingof the mixing and regulating pipe; and a spindle for causing said plugto advance or recede so as to vary the annular space between it and thepipe end; substantially as described.

4. In an automatic injector' burner comprising a steam inlet pipe havinga jet discharge opening; an oil supply pipe Whose inlet is in closeproximity to the steam jet; a mixing and regulating pipe into which thesteam and oil pipes enter; a plug located within the discharge openingof the mixing and regulating pipe; and a spindle for causing said plugto advance orrecede so as to vary the annular' space between it and thepipe end; and an air inlet pipe surrounding the mixing and regulatingpipe; substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

STANLEY C. NORTH. Writnesses:

J. B. CONKLING, S. W. VAN SYCKEL.

